Foo Fighters will replace Stevie Nicks on the bill at Shaky Knees Festival in October after the latter cancelled all of her 2021 tour dates this week.The Central Park, Atlanta festival, which will take place from October 22-24, had been set to welcome the Fleetwood Mac musician as their Friday night headliner.However, Nicks cancelled her Shaky Knees slot this week along with her other 2021 gigs, citing concerns over the coronavirus pandemic.Telling her fans that she was “devastated” to have to